1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Copyright (C) 2021 Sifive. 4 */ 5 6#ifndef __ASM_ALTERNATIVE_H 7#define __ASM_ALTERNATIVE_H 8 9#include <asm/alternative-macros.h> 10 11#ifndef __ASSEMBLY__ 12 13#ifdef CONFIG_RISCV_ALTERNATIVE 14 15#include <linux/init.h> 16#include <linux/kernel.h> 17#include <linux/types.h> 18#include <linux/stddef.h> 19#include <asm/hwcap.h> 20 21#define PATCH_ID_CPUFEATURE_ID(p) lower_16_bits(p) 22#define PATCH_ID_CPUFEATURE_VALUE(p) upper_16_bits(p) 23 24#define RISCV_ALTERNATIVES_BOOT 0 /* alternatives applied during regular boot */ 25#define RISCV_ALTERNATIVES_MODULE 1 /* alternatives applied during module-init */ 26#define RISCV_ALTERNATIVES_EARLY_BOOT 2 /* alternatives applied before mmu start */ 27 28/* add the relative offset to the address of the offset to get the absolute address */ 29#define __ALT_PTR(a, f) ((void *)&(a)->f + (a)->f) 30#define ALT_OLD_PTR(a) __ALT_PTR(a, old_offset) 31#define ALT_ALT_PTR(a) __ALT_PTR(a, alt_offset) 32 33void __init apply_boot_alternatives(void); 34void __init apply_early_boot_alternatives(void); 35void apply_module_alternatives(void *start, size_t length); 36 37void riscv_alternative_fix_offsets(void *alt_ptr, unsigned int len, 38 int patch_offset); 39 40struct alt_entry { 41 s32 old_offset; /* offset relative to original instruction or data */ 42 s32 alt_offset; /* offset relative to replacement instruction or data */ 43 u16 vendor_id; /* CPU vendor ID */ 44 u16 alt_len; /* The replacement size */ 45 u32 patch_id; /* The patch ID (erratum ID or cpufeature ID) */ 46}; 47 48void andes_errata_patch_func(struct alt_entry *begin, struct alt_entry *end, 49 unsigned long archid, unsigned long impid, 50 unsigned int stage); 51void sifive_errata_patch_func(struct alt_entry *begin, struct alt_entry *end, 52 unsigned long archid, unsigned long impid, 53 unsigned int stage); 54void thead_errata_patch_func(struct alt_entry *begin, struct alt_entry *end, 55 unsigned long archid, unsigned long impid, 56 unsigned int stage); 57 58void riscv_cpufeature_patch_func(struct alt_entry *begin, struct alt_entry *end, 59 unsigned int stage); 60 61#else /* CONFIG_RISCV_ALTERNATIVE */ 62 63static inline void apply_boot_alternatives(void) { } 64static inline void apply_early_boot_alternatives(void) { } 65static inline void apply_module_alternatives(void *start, size_t length) { } 66 67#endif /* CONFIG_RISCV_ALTERNATIVE */ 68 69#endif 70#endif 71